[wasm] remove faux code objects

src/compiler/linkage.h

Index: src/compiler/linkage.h
diff --git a/src/compiler/linkage.h b/src/compiler/linkage.h
index 8596327290b0643340868475e0a9580ad5ddb964..762e2a2b0ad2fa5b4b88c6a8cebe96c7772e6b21 100644
--- a/src/compiler/linkage.h
+++ b/src/compiler/linkage.h
@@ -144,9 +144,10 @@ class CallDescriptor final : public ZoneObject {
  public:
   // Describes the kind of this call, which determines the target.
   enum Kind {
-    kCallCodeObject,  // target is a Code object
-    kCallJSFunction,  // target is a JSFunction object
-    kCallAddress      // target is a machine pointer
+    kCallCodeObject,    // target is a Code object
+    kCallWasmFunction,  // target is a Wasm function identified by its index
+    kCallJSFunction,    // target is a JSFunction object
+    kCallAddress        // target is a machine pointer
   };
 
   enum Flag {